/Engine/Source/Runtime/Core/Public/Containers/RingBuffer.h
Given a pointer to an Element anywhere in memory, return the index of the element in the RingBuffer, or INDEX_NONE if it is not present.
[IndexType](API\Runtime\Core\Containers\TRingBuffer\IndexType) ConvertPointerToIndex ( const [ElementType](API\Runtime\Core\Containers\TRingBuffer\ElementType) * Ptr ) const